Our Data Sources
21, Sibley Avenue, Harpenden has 21 entries in the Land Registry , most recently in July 2007 and no records in the EPC database.
We combine this sold price information with public data of neighbouring properties to estimate the attributes and values.
The local information is scored as 4 out of 5 and is considered of high accuracy.
Price Range & Condition
Decorative condition can have a big effect on a property's value and this effect varies depending on the type, size and location of the property.
If 21, Sibley Avenue, Harpenden is in very good condition we estimate a sale value of £854,326 and a rental value of £3,074 per month.
However, if the property needs a lot of cosmetic work we estimate a sale value of £756,689 and a rental value of £2,723 per month.
Plot Size
According to data from HM Land Registry, 21, Sibley Avenue, Harpenden sits on a plot of 685 m2.
We have plot size data on 27 out of 36 other houses in the postcode and 21, Sibley Avenue, Harpenden sits on the 4th largest plot.
Sold Prices
According to HM Land Registry, 21, Sibley Avenue, Harpenden was last sold on 6th July 2007 for £395,000 and was recorded as a freehold house.
The property has had 2 sales since 1995.
Since July 2007, the market for similar properties has risen by 83.6%.
- Sold Jul 2007£395,000
- Sold Mar 1999£108,000
Similar Properties Sold Nearby
According to the Land Registry and our network of Estate Agents, there have been 158 sales of properties similar to 21, Sibley Avenue, Harpenden within a radius of 700 metres over the last 2 years.
The most recent example is 13, Meadway, Harpenden, AL5 1JN, a freehold house which sold for £730,000 on the 18th November 2025.
Read more about house prices in AL5.
- Sold Nov 2025£730,000 | 3 Bed House13, Meadway, Harpenden, AL5 1JN13, Meadway, Harpenden, AL5 1JN
- Sold Nov 2023£690,000 | 3 Bed House2, Meadway, Harpenden, AL5 1JL2, Meadway, Harpenden, AL5 1JL
- Sold Jun 2023£500,000 | 3 Bed House27, Sibley Avenue, Harpenden, AL5 1HF27, Sibley Avenue, Harpenden, AL5 1HF
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
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Location Comparison
Sibley Avenue, Harpenden, AL5 has a total of 53 addresses. According to our analysis of all the public data, 21, Sibley Avenue, Harpenden is the 37th largest and the 33rd most expensive property on the street.
When compared to the postcode district it is £153k less expensive than the average property in AL5.
More reading links
Schools Nearby
- The Grove Infant and Nursery School300 m away
- The Grove Junior School400 m away
- High Beeches Primary School800 m away
- Katherine Warington School1.8 km away
- Sir John Lawes School2.0 km away
- St George's School2.3 km away
More reading links
Public Transport Nearby
- Harpenden|1.6 km away
- St Albans City|6.3 km away
- St Albans Abbey|6.9 km away
Available Internet Speeds
According to recent data from Ofcom, Ultrafast Broadband is available in this area.
According to recent data from Ofcom, Ultrafast Broadband is available in the area.
Risk of Flooding
According to data from the Environment Agency, the flood risk in this area is considered to be Very Low.
